This invention offers a power supply circuit that is capable of improving a power factor as well as reducing a ripple current of an input/output of the power supply circuit due to switching of a switching device. The power supply circuit is provided with a first power supply circuit including first and second switching devices, a second power supply circuit including third and fourth switching devices and a switching control circuit. The switching control circuit controls the switching devices so that the first switching device and the third switching device are turned on and off at timings different from each other when an alternating current voltage from an alternating current power supply is positive, and the second switching device and the fourth switching device are turned on and off at timings different from each other when the alternating current voltage is negative.
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1. A power supply circuit comprising: a positive-side output terminal; a negative-side output terminal; a first power supply circuit comprising first and second alternating current input lines between which an alternating current voltage is applied, a first bridge circuit comprising first, second, third and fourth rectifying devices each of which is connected to the first or second alternating current input line and generating an output voltage between the positive-side output terminal and the negative-side output terminal by full-wave rectifying the alternating current voltage, a first switching device connected in parallel with the first rectifying device that is connected with the negative-side output terminal, and a second switching device connected in parallel with the second rectifying device that is connected with the negative-side output terminal; a second power supply circuit comprising a third alternating current input line connected with the first alternating current input line, a fourth alternating current input line connected with the second alternating current input line, a second bridge circuit comprising fifth, sixth, seventh and eighth rectifying devices each of which is connected to the third or fourth alternating current input line and generating an output voltage between the positive-side output terminal and the negative-side output terminal, a third switching device connected in parallel with the fifth rectifying device that is connected with the negative-side output terminal and a fourth switching device connected in parallel with the sixth rectifying device that is connected with the negative-side output terminal; and a switching control circuit controlling switching timings of the first, second, third and fourth switching devices so that the first switching device and the third switching device are turned on and off at timings different from each other when the alternating current voltage on the first alternating current input line is positive relative to the alternating current voltage on the second alternating current input line and the second switching device and the fourth switching device are turned on and off at timings different from each other when the alternating current voltage on the first alternating current input line is negative relative to the alternating current voltage on the second alternating current input line.
The power supply circuit improves power factor and reduces input/output ripple. It has a positive and negative output. A first power supply circuit includes AC input lines and a bridge circuit that rectifies the AC voltage into DC between the outputs. First and second switches are in parallel with rectifiers connected to the negative output. A second power supply circuit mirrors this setup with its own AC input lines and bridge circuit with fifth and sixth rectifiers, plus third and fourth switches in parallel with rectifiers connected to the negative output. A control circuit switches the first and third switches at different times when the AC voltage is positive and the second and fourth switches at different times when the AC voltage is negative.
2. The power supply circuit of claim 1 , further comprising a first reactor connected to the first alternating current input line, a second reactor connected to the second alternating input line, a third reactor connected to the third alternating current input line and a fourth reactor connected to the fourth alternating current input line, wherein the alternating current voltage is applied to each of the first, second, third and fourth alternating current input lines through each of the first, second, third and fourth reactors, respectively.
The power supply circuit described in Claim 1, which improves power factor and reduces input/output ripple, also includes reactors (inductors) on each AC input line to further refine the AC input. Specifically, there is a first reactor on the first AC input line, a second reactor on the second AC input line, a third reactor on the third AC input line, and a fourth reactor on the fourth AC input line. The AC voltage is applied to each AC input through these reactors. This configuration uses a first and second power supply circuit including AC input lines and bridge circuits which rectify the AC voltage into DC between the positive and negative outputs. The circuit also has first, second, third, and fourth switches with a control circuit that turns these switches on and off at different times.
3. The power supply circuit of claim 1 , further comprising a filter to remove a ripple caused by the switching of the first, second, third or fourth switching device.
The power supply circuit described in Claim 1, which improves power factor and reduces input/output ripple, also includes a filter to smooth the DC output and reduce ripple caused by the switching of the first, second, third, and fourth switches. This filtering component reduces noise and provides a cleaner DC voltage to the connected load. This configuration uses a first and second power supply circuit including AC input lines and bridge circuits which rectify the AC voltage into DC between the positive and negative outputs. The circuit also has first, second, third, and fourth switches with a control circuit that turns these switches on and off at different times.
4. The power supply circuit of claim 1 , further comprising a first current detection device to detect a current flowing through the first or second switching device and a second current detection device to detect a current flowing through the third or fourth switching device, wherein the switching control circuit controls switching of the first, second, third and fourth switching devices based on a result of detection by the first or second current detection device and a signal generated by dividing the output voltage.
The power supply circuit described in Claim 1, which improves power factor and reduces input/output ripple, monitors current flow and voltage output to dynamically control switching. It includes a first current sensor to measure current through the first or second switch, and a second current sensor to measure current through the third or fourth switch. The control circuit uses these current measurements, along with a voltage divider signal representing the output voltage, to adjust the switching of the first, second, third, and fourth switches. This allows for feedback-based optimization of the power supply's performance. The first and second power supply circuits include AC input lines and bridge circuits which rectify the AC voltage into DC between the positive and negative outputs. The circuit also has first, second, third, and fourth switches.
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May 17, 2011
September 17, 2013
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